Good point, Brave's responsibility as a for-profit enterprise is to attempt to go full Paperclip Game and grow to consume the entire universe.
More seriously, I don't think for-profit/non-profit really matters here. Mozilla's reasoning was pretty clear (for better or worse) that they saw these adjacent services as helping to break into the lock-in of Apple/Google/MS who used either their own browser-adjacent services to push their own browsers, or to provide privacy-respecting versions of services (in an attempt to displace, say, Zoom).
A nonprofit where the people at the top have multi-million dollar salaries (see https://calpaterson.com/mozilla.html) Yes, Brave is for profit, but not at the cost of user data and/or trust. Brave doesn't collect or exchange your data. Firefox, on the other hand, transmits your keystrokes to Google right out of the box. Leith did a great side-by-side comparison of various top browsers (including Firefox and Brave), finding the latter to be in a class of its own in terms of privacy out of the box: https://www.scss.tcd.ie/Doug.Leith/pubs/browser_privacy.pdf.
